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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=396e3ecf3e8f0f05bd7eeaf995a3f0c2327a6cd6
commit 396e3ecf3e8f0f05bd7eeaf995a3f0c2327a6cd6
Author: Joseph Myers <joseph@codesourcery.com>
Date: Thu Jan 2 16:33:06 2014 +0000
Fix ldbl-128ibm acoshl inaccuracy (bug 16384).
This patch fixes bug 16384, ldbl-128ibm acoshl inaccuracy, which
showed up while attempting to regenerate ulps for powerpc-nofpu for
2.19. There were two separate problems, use of __log1p instead of
__log1pl and an insufficiently accurate constant value for log 2
(which this patch replaces by use of M_LN2l), each of which could
cause substantial inaccuracy in affected cases.
Tested for powerpc-nofpu.
* sysdeps/ieee754/ldbl-128ibm/e_acoshl.c (ln2): Initialize with
M_LN2l.
(__ieee754_acoshl): Use __log1pl not __log1p.
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 7 +++++++
NEWS | 2 +-
sysdeps/ieee754/ldbl-128ibm/e_acoshl.c | 4 ++--
3 files changed, 10 insertions(+), 3 deletions(-)